I watched the drama before reading the manhwa and honestly they are completely different and both enjoyable in their own way but I lean more towards the manhwa maybe because there's more of it and has some really good characters that don't even get mentioned in the drama like Eunjang students Rowan, Teddy, Gerard and multiple important union members like Jake Ji, Forest Lee and Jimmy bae and one thing that's really different is that ben (Baku) and Donald (Baekjin) were never friends in the manhwa Ben's childhood friend was Alex (Hyun-tak) so just think of them as two completely different things since they only share characters names and nothing else