@Hannah Bello Happy (the singer) was drugged and now struggles with feeling emotions and other side effects of the drug. Happy (the rapper) is trying to help him feel again and get back everything he lost due to the drug scandal. Happy (the rapper) is also trying to find out who drugged his boo thang so he can put a stop to the drug.
Happy (the rapper) has a friend who owns a club (The noona in her underwear) and she's been helping him investigate this whole drug thing. Now... Underwear noona is "getting it on" with the doctor who coincidentally happens to be Happy the singer's psychiatrist (he's also been trying to help Happy overcome the effects of the drug).
Blondie at the end is a former member of the idol group Happy the singer was in, and he's the one that drugged our sweetheart. And now we're seeing him murder what I think is an undercover cop, to cover his tracks.
Ps: I just copies what another user Said : KirraQween
