Responses
I'm sure he has a mother complex, that'd explain why he likes Bum.
But I wouldn't say he was drunk- tbh it felt more like he was faking it, else why would he be able to save both of them from that car accident? I have never been drunk myself but I'm preeeeetty sure that wouldn't be possible (〜￣△￣)〜
The reason Sangwoo was sick was because he was drink, but it may have been because Bum wanted him to lick it....I don't think Sangwoo is at that level and he never will be!!! When he said "I WIN" I first thought he meant over Bum, But the more i think about it the more i feel.... He means his father and Bum's Uncle, After everything he wen't through with his Father and everything Bum wen't through.... He feels he has won!
Also his relationship with his Mother was more that Mother and Son I'm sure of it... and he see's his Mather in Bum in a strange way.