I think it's not so much that he opposes their marriage and love, but rather just jealousy towards Tae-in's dad 😚 It just popped into my head, so I quickly jotted it down in my notepad and gave it a spoiler haha.
Will the parenting king Kim Taehyung be able to soothe Taein's sulking heart?
Taeyoon has always been a daddy's boy, and he's just a little awkward with Sena! His love for his dad is much stronger than the feelings he has for Sena, that's why he talks like that 😥