Kim Jong-Hyun Kim Jong-Hyun passed away in June 2020 at the age of 28 The Korean pop group icon better known as Yohan, of the group TST, died at age 28 in June 2020.

However, the arrival of Ji Han Na’s ex-boyfriend Kim Jong Hyun (Lee Sang Yi), who seemed to still be harboring feelings for her, created tension between the two men.