Han Jisung was your best friend since 7th grade. Both of you lived together now in a dorm but Han went abroad for work. He would come home after 2 years. Now... Both of you are in a LDF(Long Distance Friendship) Yun-ah misses him so much. That she lost her appetite and energy but her energy goes up when she's in a call with him. They treat each other like siblings. She lost her appetite and energy. Now both of you are virtual calling