Their soul were connected accidentally after MC and ML suffered the same car accident. They both lived in the different world but MC could cross over to ML's world after the accident.

MC and ML are actually living in different worlds. MC at first couldn't control her crossovers and would pop up as different things around ML. The plot is cliche so of course the leads will fall in love over time. They will end up being together but their worlds will slowly merge. In the meantime, MC learns to better control her crossing over into ML's world. At the end of the novel, ML is able to crossover into MC's world but the worlds never fully merge even after they have children.

MC and ML ended up being connected somehow when they had car accidents in their respective worlds at the exact same time and place. They hit each other's cars. That's the explanation given but then it should be that the worlds were merging already, so they hit each other... not that they hit each other and that's why the worlds started merging. The author uses the latter reasoning for why the merging of the world centers around the main characters. So yeah, the logic is not logical. 👀

when the MC's friend's brother tampered with her car brakes and nearly caused her to drive into a truck, she didn't do anything about it when she returned and found out he was arrested for drugs.

The author also didn't mention what happened to her other friend's brother who pursued her so persistently and insisted on meeting the ML. He completely disappeared from the story after that.

There's also her uncle's family, who needed money and were being investigated. The last thing we know is that he wants to sell his land, but whether he got arrested is unknown.