I've read from up to chapter 30 end of season 1 and they revealed another info about the bottom. this is kinda predictable ngl there is 3 manhwas out there with the same plot. can't believe they just copy pasted it and submitted the homework thinking no one will notice.
it's suspected that the top's mafia/gang company got involved the bottom's family business before they went bankrupt. Top already has an inkling but wouldn't tell bottom because he doesn't want to make a big deal like what he doesn't know wont hurt him mindset.