The Farewell Song

Good boy gone bad, reunion, steamy goodness.

Speed and Love is more wattpad coded but The Farewell Song has a lot of parallels and if you like the basic story (of two people who partially grew up together as fake siblings, later separate and then reunite with the ML having become a fighter, then you’ll probably also like this).
TFS has a mystery element (who done it) but I would recommend you check it out

Teen romance interrupted/paused by a suspicious death in the female lead's family.
Reborn's female lead's sister has died, TFS's female lead's mother has died.

It's not exactly similar but somehow a bit part of story is similar ..The ML's father is suspect to murder FL's mother and leads are childhood sweetheart.