The King's Game of Love(2014)

Ousama no Koiasobi

Makino is a corporate spy who works under the guise of a part-time worker. He's sneaked into Prad., a big company headquartered in the United States. Things are going well until one day, Kamina, the new boss slated to become the next CEO, discovers his identity. From that day on, Makino is forced to live under Kamina's watch in his posh apartment, but the proximity may be too close for comfort...

(Source: Renta!)