I think the ex gf was hurt on the beach and doha was present I don't know if he hurt her or not but in the flashbacks that doha has are kinda different from what he told mok solhee because in his flashbacks there was a broken beer bottle that he was holding and it also had blood. i also think that the ceo and doha's mother has something to do with it or they know something they don't want doha to know
i also think that the ceo and doha's mother has something to do with it or they know something they don't want doha to know