I think it was a manhwa or webtoon. The FL was slightly tan and ml...i forgot. Basically FL got broken up w her bf because I think he was jealous of her popularity or smthg but she was the one who made him popular cus he was mad horrible with fashion in the past. The ex starts dating this girl that sings in the streets. Plot twist is this girl was originally dating ML but then broke up. She wore this bunny mask when singing in public streets.
Basically whole plot is the ex bf of FLand ex gf of ML joins some online streaming dating game where couples join to see if they last throughout the stream. FL finds out and confronts ML that they should join too since their exes are joining, and theyll go under disguise as a couple just to annoy them and take the reward money i think?

I really like plots where the mc is unaware of the power they possess OR mc is misunderstood to be op!!!
Some examples of what I'm reading currently are:
Raising Villains the Right Way
I Was Possessed, but It Became a Ghost Story
The Painter Who Draws Dungeons (LOVE THIS ONE THE MOST RN!!)
I'm Not That Kind Of Talent
takes his dead twins place who’s OP and has to pretend to be him https://www.mangago.me/read-manga/the_knight_of_embers/
this is BL so this ofc may not be ur trope but a similar one is this where the guy doesn’t realize how powerful he actually is https://www.mangago.me/read-manga/a_guide_thicker_than_blood/