In 2023, Heejae participated in JTBC's reality competition show, Peak Time, as Team 7:00 with his former group member Ireah and achieved second place.
In May 2023, Heejae and Ireah signed an exclusive contract with PCS Entertainment and started a new journey as a duo named Sevenus.
[1][2][3] On August 19, 2016, Heejae debuted as the lead vocalist of four-member idol group Masc with the EP Strange.
In 2023, Heejae participated in JTBC's survival reality show Peak Time as part of Team 7:00 alongside fellow group member, Ireah.
[12][13][14][15][16][17][18][19] On May 3, 2023, Heejae and Ireah signed an exclusive contract with PCS Entertainment and formed the duo Sevenus.