Well, I do not remember much about the story but in one of the arcs the MC is a sick child loved by his parents and mistreated by his sister and the ML is the man with whom his sister is going to marry
By any chance; Did his sister beat him up in his own room while he was ill? Or tried to poison him with milk? Or forcefully stole his smart watch which was connected to his pulse? Or set him up to be convicted for petty gang theft? They shall be, save one, are from different arcs. If one fits, might help to pin down the story. Never mind ... @karenen had already found it? Chasing you from wattpad 1st arc seems to be the one you're looking for.