"100 days left, and I'm still a virgin"

Kun-Hee is a 21-year-old university student. He has a girlfriend but is still a virgin because her, Goo-I, said that she will be a virgin until marriage. Instead of a girlfriend showing no sign of permission, a tempting offer comes to Kun-Hee, in a hurry before enlistment...

(Source: TOPTOON, translated)