Devan is an idiot for all the reasons pointed out in this thread, but I can't figure out Jihoon and his parents. Apparently, he's not the oldest son so he doesn't have the same responsibilities toward his parents that goes with that role. wants. Still, Koreans value education, work, and reputation. While living at home isn't unusual, Jihoon's lack of company employment, ditzy goth girlfriend with fatherless kid, and now baby presumably with Jihoon are not situations that would make Korean parents happy. These people are unusually kind. Maybe they blame themselves for spoiling him.
As for Jenny, she lived with Sumit's family for several months, so his parents must be real. If this is scripted, she is in on it too. I hope the truth escapes somehow.