Looking for an specific K-drama! Help!

Hi! So yesterday I saw a video about a k-drama where a husband cheates on his wife. The scene specifically pictured said husband and wife meeting at something like an art gallery, and he was accompanied by the girl he cheated on his wife with. The side-chick was kind of mocking the wife about a necklace, and then another man comes in (maybe the wife's new boyfriend/love interest?) to save the day. Does it ring a bell? I'm looking everywhere but I can't find it anywhere, help!!!