Looking for manhwa

Looking for manhwa where the mc has a female childhood friend, who she has a crush on but the girl suddenly got a popular boyfriend.

I cant remember well but im pretty sure the mc also got a phone with power(s/??)

And the boyfriend is turn out to be a cheater, and he's now in his mission to expose him

Then the last thing i remember is that there's another fl, who was getting bullied(?) And like flowers