Cha Sun-Hee (Lee Da-Hae) is a housewife and she is married to Bong Cheon-Dae (Bae Soo-Bin). Her husband is currently unemployed. She has a twin sister, Cha Do-Hee (Lee Da-Hae), who works as a flight attendant. Although they are identical twins, they have completely opposite personalities. Cha Do-Hee becomes involved in a situation which leads to Cha Sun-Hee pretending to be her flight attendant sister. She then meets co-pilot Song Woo-Jin (Ryu Soo-Young).
The Secret of My Love is a 2017 South Korean television series starring Song Chang-eui, Kang Se-jung, Kim Da-hyun, and Park Jung-ah. Plot : A man desperately wants to be "real," so he puts on a "real" mask. A woman wants to be loved so much that she throws out her younger sister and replaces her. The drama shows the struggles of these two, man and woman, who look for ways to find true happiness in their lives.