Because of increased tensions with north Korea women are now also included in the draft and every South Korean citizen has to start this now 7 years long draft before they turn 28.

WILT is a group of Korean idols which flopped at its début but is now only starting to get some traction as members are already in their mid 20s.

Going to the draft now would shatter their whole carrier, however, a single exception to the draft exists: motherhood.

For that reason, the agency managing WILT as many other agencies found that getting their members pregnant was less risky than having them leave the scene for 7 years. Also using this opportunity to strengthen ties between members, it was decided that all 4 would get pregnant from the same man and feuds with hardcore fans, it was decided to hire you, a random foreigner who never even heard of the group to impregnate all 4 girls. Good luck!

PS: the group name doesn't mean anything, I made it up and the character names are also picked arbitrarily so if you want to suggest different names, feel free.

Also canonically they never had time for anything else than training to be idols so that means the 4 girls haven't dated before, I can change that too if you think it might be better or make a different version with popular modifications