Lee Eui Ryuan, 31, was arrested at the room No 348 on the 28th floor of Ideo Verve Condominium in Bangkok Vatana’s district at 6 am.
Acting on tips-off, police raided the room and found the South Korean man with two computers and four bank transaction confirming devices in his room.
The man admitted that he has been running a gambling website for South Koreans to bet with about Bt500,000 changing hands each day.
Police also found 0.65 grammes of crystal methamphetamine in the room.