@Fix There are 2 endings.
Spoiler!
One's the OG webnovel's, where he gets the revenge, becomes chairman, gets married and lives happily(he's dojun here, like in the manhwa),
while the other is the K-drama ending where he wakes up from a coma realizing that it was all a dream and then uses the info from the dream to get his revenge in real life (he's the OG guy here because Dojun is dead irl)