The two chaebol heir and heiress disguised themselves as  ordinary empolyees in a large company for uncertain reason. The fate arrange them to meet again and open the past that they never expect. Lee Jonghyun, an oldest son of Lee J Group begged to his grandfather in case that he could enter the company without anyone knowing who he is.  Gong Seungyeon, her true name is Yoo Seungyeon. The heiress of the GL corporation, one of the conglomerate in South Korea. She left her family

When We Were In Love talks about a beautiful love story between Lee Jong Hyun and Gong Seung Yeon as main characters. They were both deeply in love during their stint in the famous variety show We Got Married that they decided to bring real feelings into their private lives. They have been through a lot in their 3 years of secretly dating each other

She keeps telling herself to focus on the job. But no matter how hard she tries to, the beautiful gentleman keeps distracting her with a bar of chocolate and notes.