Instincts, he knew that there’s a small familial bond between him and the entity inside Yirim’s body (it’s stated on the same chapter). This trope in omegaverse has been famous lately - evident in Minmotion syndrome and hinted in Tadaima, Okaeri when Hikari could feel a familial bond between him and his unborn sister.
Hope this helps!
Ahh ok does that mean he knows yirim didn't actually sleep with anyone else
Yep, if you analyze the chapter, Cheongho wasn’t even paying attention to what Yirim was saying lol. He just knows that Yirim was panicking and blabbering
thank you very much
I was just rereading and in 28 uni says the baby might not be yours so I wonder if sene knows he is acc the only one whose been with yirim ik he knows the baby was his but not sure if he knew that part