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? (Source: TVDb)