Season 4

E1. Heart Signal is Back

May 17, 2023 · 111m

This spring of 2023, young men and women have gathered again for the 4th season of Heart Signal. Yoon Jong-shin, Lee Sang-min, Kim Ea-na, Kang Seung-yoon, Mimi, and Kim Chong-ki join as panelists. Heart Signal 4 finally begins, and 6 occupants are revealed. What are the heart signals that were sent on the first day that will make your heart flutter? Meanwhile, someone’s word turns the place into a battlefield. Will there be a storm at the Signal House?

E2. Grocery Shopping

May 24, 2023 · 110m

The guys are busy on the weekend morning because of Ji-young. How did Ji-young capture the guys and make them flustered? Divided into three couples, the occupants spend the day together. Where will their signals go after short dates? Finally, the unexpected identities of the occupants are revealed. The old panelists show off their skills, and the new panelists are getting used to reading the signals. Will they be able to get it right again in a row?

E3. For You, Without Your Knowing

Jun 2, 2023 · 107m

Mysterious objects are placed in front of the Signal House, arousing everyone's curiosity. The participants figure out that there will be a newcomer. Ju-mi is confused by how Ji-min and Min-kyu behave. Gyeo-re feels more distant from Ji-young. Ji-won can't make it back to the Signal House because of his night duty. Right then, a newcomer arrives, making everyone nervous.

E4. The First Date

Jun 9, 2023 · 115m

The participants have their first dates. The ladies choose the gifts that men prepared without knowing whom they are from. Ju-mi wins in rock-paper-scissors and gets to go on a date with two male participants. They are all surprised by their unexpected date partners. Will their feelings change after their dates? Or will they stay the same?

E5. A Face-To-Face Talk

Jun 16, 2023 · 111m

The ladies sit together and talk about their true feelings. They reveal whom they’re drawn to and how their feelings have changed. After they return home, they decide to have a 1-on-1 talk with the guys of their choice. Will their feelings change after the talk, or will they remain the same?

E6. A New Occupant

Jun 23, 2023 · 113m

A new female occupant joins the participants, and they have a welcoming party together. The appearance of a new occupant complicates their feelings even more. Ji-min and Min-kyu have a secret date outside. Ji-won has the long-awaited date with Ji-young. It’s their last day to express their feelings to one another through a text. To whom will they send their love signals?

E7. Truth or Dare

Jun 30, 2023 · 113m

Ji-young and Gyeo-re have another date, and Gyeo-re doesn’t hide his feelings toward Ji-young. Ji-young confronts Min-kyu and asks if he’s avoiding her on purpose. Yi-soo has a date with Min-kyu, and she straightforwardly asks whom he has feelings for. Later, the occupants gather to play Truth or Dare, where their feelings are revealed.

E8. The Long-Awaited Dates

Jul 7, 2023 · 115m

The ladies get to choose their partners for their next date. Ju-mi takes Min-kyu to a special music café which helps him relax and loosen up. Yi-soo has a date with Gyeo-re and forms an unexpected alliance. Min-kyu has another date with Ji-young, and he shares his honest feelings with her. Meanwhile, Ji-min has the long-awaited date with Ji-won.

E9. Complicated Feelings

Jul 14, 2023 · 107m

The four men gather to drink and reveal how they truly feel about the female participants. Gyeo-re doesn’t shy away from expressing his feelings toward Ji-young. Ju-mi realizes that she has developed feelings for Gyeo-re. Hoo-shin has an official date with Ji-young, and his feelings toward her grow bigger. Meanwhile, Min-kyu develops new feelings for Yi-soo.

E10. Wrong Time

Jul 21, 2023 · 111m

Min-kyu and Ji-young have another date, and they check their feelings toward each other. But when they return to Signal House, Min-kyu behaves differently. Min-kyu, Ji-young, Hoo-shin, and Yi-soo have a fun yet confusing date at an amusement park and go out for drinks. Ju-mi tells Gyeo-re how she feels toward him, but his response disappoints her.

E11. The True Feelings

Jul 28, 2023 · 111m

Gyeo-re, Ji-won, Ji-young, and Yi-soo visit Mount Nam and enjoy seeing cherry blossoms. During dinner, Gyeo-re straightforwardly asks Ji-young why she wasn’t honest with her feelings, which makes Ji-young flustered. Ji-min shares her genuine feelings with Hoo-shin, Ju-mi, and Min-kyu. The occupants are going on the last trip, and the ladies get to pick their partners for the trip.

E12. The Last Trip

Aug 4, 2023 · 122m

The male occupants are given tickets to different destinations selected by the ladies. During their trips, they check their feelings toward each other once again. Some become more certain of their feelings, while others are still confused. At the end of their first day, they gather in Yeosu to share how their dates went.

E13. The Second Date in Yeosu

Aug 11, 2023 · 108m

The occupants go on their second date in Yeosu. Some end up with the partners they wanted, but some reluctantly go out with unexpected partners. Ji-won loses his chance to go out with Ji-young. Ji-min clearly expresses her feelings toward Hoo-shin. Gyeo-re consoles Ji-young who seems to be going through a lot. After their date, they all gather at the airport to fly back to Seoul.

E14. The Last Chance

Aug 18, 2023 · 100m

The occupants come back to Signal House after their trip. Their feelings are more complicated than they were before the trip. Ji-won asks Ji-young one last time and shares his honest thoughts. Gyeo-re invites Ji-young to his cafe and has a great time with her. Ji-min finally has a gopchang date with Hoo-shin, and Hoo-shin's thoughts become more complicated after the date.

E15. The Final Decisions

Aug 25, 2023 · 115m

Ji-young has one last date with Min-kyu. They share their honest feelings, and this helps them finalize their decisions. Hoo-shin is still torn, but he reaches a conclusion in the end. Ji-min doesn't hesitate to keep expressing her feelings toward Hoo-shin. Ju-mi delivers her feelings toward Gyeo-re one last time. Ji-won writes a letter to Ji-young to express his feelings. On the last day, they make their final decisions.

E16. After Signal (1)

Sep 1, 2023 · 87m

The occupants' stories after their final decisions are revealed. The final couples share what it had been like for the past five months while the show was being aired. Hoo-shin and Ji-min join Ea-na, Mimi, and Dawn for the commentary. They also share how things have been for the occupants and how they've been bonding.

E17. After Signal (2)

Sep 8, 2023 · 86m

This week, Oking, Hoo-shin, and Min-kyu join the panelists. Ji-young and Gyeo-re's date is shared, and Ji-young talks about how Gyeo-re made her feel neglected. The occupants gather together to watch the first episode of Heart Signal. Some are embarrassed by their actions, while some are intrigued by their current partners' responses to the other occupants.

E18. After Signal (3)

Sep 15, 2023 · 82m

This week, Ji-young and Yi-soo join the panelists. Yi-soo and Min-kyu's date is revealed first. They go paragliding together and talk about the things that have been bothering them over dinner. Ji-young meets Gyeo-re's friends for the first time, and they make mugs together. Ji-won and Ju-mi go on a date where they shop for clothes together. Lastly, Hoo-shin and Ji-min's date is revealed. They go trout fishing and have dinner where they talk in depth.

E19. After Signal (4)

Sep 22, 2023 · 99m

This week, Ju-mi and Ji-won join the panelists and share their thoughts. Their date at a gopchang restaurant is revealed. Every occupant, except for Gyeo-re, go camping together. They pitch a tent together and have a barbecue party. They also talk about the memorable scenes and comments they made in Signal House. Lastly, the two official couples share their honest feelings toward their partners.

E20. After Signal (5)

Sep 29, 2023 · 72m

In this special episode, the viewers will be able to catch some new scenes and conversations that weren't shown in the previous episodes. A secret conversation between Ji-young and Gyeo-re and deep conversations between Ju-mi and Ji-won are shared. Lastly, the occupants share their thoughts on After Signal.