
Friend Sister 4 revolves around romantic and family relationships. Minsu quits his job at the company because his job is far from home. So, as a special measure, he will stay at his friend’s house for a while. Min-soo falls in love with Jae-seok’s older sister, Yoon-jung, at first sight. Meanwhile, Jae-seok decides to live with his girlfriend, Hae-ju, at home. Min-soo and Yoon-jung are alone together, and their feelings gradually grow…