I think you didn't understand the dialogue. Jihwan said he's happy because Hyung is kinda disappointed. Because he wanted to be pregnant with Jihwan's baby.
It didn’t seem that way especially if you look how he reacted when mc told him he may be pregnant + the fact that he never wanted kids and literally got a vasectomy
This is how I also understood him. Also, him not wanting kids could change most especially if it’s with MC ╮(￣▽￣)╭
i thought he only got it cause when he was a call boy he had female clients
he said that he would be okay having a baby if it’s with jihwan
idk but it doesn’t sit right with me that jiwan literally said that he’s happy that MC is not pregnant but MC is obviously NOT happy at all about it.. this will create problems in the future for sure.. and makes me low key sad