I wasn’t sure if it was Japanese or Korean but it was from an ad on instragram. It’s royalty au I think. It’s straight. The female lead(I’m assuming) is supposed to be with a long haired male lead(?). He had dark hair and she overheard him say he never wanted a mate. There’s also another girl who was hanging on the male leads arm. I also remember the FL waking up from her bed and she sees who I think was the ML standing by or sitting beside her bed.
It’s crazy how he ended up with a wife who is capable of handling his personality and an adorable child. The fact that he could have acted differently and ended up having a genuine relationship with Momo(pr even his wife) but due to his own weakness, he could not. Luckily, Momo is truly happy and in love now.