I thought they already become a couple. Why do they seem like just reunited 😭

They don't have label lolol. They just upgraded from not being able to touch mo without being disgusted into being able to touch him and mo only getting irritated. Also, Mo's letting Tian kiss him here and there!! Which is a good development! Their first kiss, Mo even cried out of being disgusted.

Because he tian left, and this is taking place after he came back. That’s why mo is furious.