This is grounds for divorce.This is because cheating refers to ‘any unjust act that is not faithful to the duty of marital chastity.’ (Supreme Court 87M5)I think it will be easier to understand if you look at an actual example.1. A case in which cheating was admitted based solely on one-sided unrequited love.It was said that the fact that her husband was attracted to a coworker of hers and unilaterally gave her a gift, sent her a poem, and contacted her on several occasions with the intention of dating her was considered cheating in his relationship with his wife. (Read more)2. A case in which the cause of marriage breakdown was acknowledged solely through the exchange of high-level text messages.The Busan Family Court ruled that although there was no clear evidence as to whether there was sexual contact, the spouse's exchange of high-quality text messages with another person of the opposite sex was the cause of the breakdown of the marriage.3. For your information, continuing to keep in touch with your ex-lover after marriage is not recognized as cheating.This is a procedure in accordance with Korean law. For foreigners, detailed procedures may vary. Please chat or email for specific details.