Jœjœ's feed

I read it a while ago, but in the manhwa the mc is the fiancé of the ML (?) and she comes to face a girl (blondie?) Who got isekaid there from another world. In the og story the ml falls in love with the new girl, but from what i remember in their story the ml doesn't even pay attention to the blondie.
Idk if this was understandable lol