"Heart Signal: Friends" brings together familiar faces from previous seasons of the popular reality dating show, reuniting cast members from "Heart Signal 2" and "Heart Signal 3" in a cozy winter setting. Oh Young Joo, Jung Jae Ho, Kim Do Gyun, Kim Jang Mi, Lee Ga Heun, Park Ji Hyun, Seo Min Jae, and Jung Eui Dong are invited to Signal House, where their relationships will be closely observed. Hosted by Kim Hee Chul, Shindong, Seunghee, and Lee Sang Min, the show promises to explore the potential romantic and friendly connections between the participants. This is a 2021 South Korean variety show produced by Channel A that delves into the dynamics of interpersonal relationships in a unique and intimate setting.

Love is back as the Signal House welcomes eight single strangers eager to find romance! Four men and four women move in under strict rules: pair up without directly expressing romantic interest, with flirting encouraged through anonymous text messages. An all-star celebrity panel led by Yoon Shi Yoon (Han Hye Jin, P.O) observes the unfolding romantic dynamics, providing commentary as love triangles emerge and potential relationships develop. As with previous seasons, the show promises to create new entertainment stars through its unique dating format. This is a 2020 South Korean reality TV/variety show co-produced by Lee Jin Min.