SEE ALSO: Monday Kiz's Lee Jin Sung ties the knot with non-celebrity girlfriend of ten years

The singer shared, "My heart feels heavy�for leaving during this sorrowful and troubled time. But I felt like I should give my farewell.. I will enlist. Until the day we meet again, see you soon~!"

Lee Jin Sung will enlist as an active-duty soldier into the 306 battalion in Uijeongbu, Gyeonggido on the 22nd at 2 PM KST.

Best of luck to to Lee Jin Sung!�