Han Ji-hye

Park Yoo-ha

Moon Soo-in

Han Young-won

Jung Mong-hee / Son Yoo-na A gifted jewelry designer, Mong-hee is the eldest child of Jung Byung-hoo and Yoon Shim-deok. Due to her family's precarious financial situation and having two younger siblings, she was forced to drop out of college so that her siblings could attend. She meets the Park family as her mother is a long-time employee of their company and soon uncovers the tragic secret behind her and Yoo-na's births. Yoo-na is the wife of Park Hyun-soo. She is a chaebol heiress who was arranged to marry him in a politically and financially motivated union. Having grown up in a wealthy but uncaring environment, she has difficulty empathizing with others and her cold and aloof mannerisms put off those around her, leading to her feeling lonely and depressed.

Chun Hae-joo Kim You-jung as young Hae-joo

Dong-nyeo Jin Se-yeon as young Dong-nyeo

Kim Ji-hyun Nam Ji-hyun as Ji-hyun (10 years old)

Na Dan-poong

Yoon Jung-won

Seo Young-ji

Yoon Jung-sook

Park Jung-Ah