Jae In seems to have it all. Raised in luxury by a powerful conglomerate family, she is a successful design lead living what she believes is a perfect life with a loving husband and son. But that perfect world implodes when she uncovers his shocking affair and a staggering betrayal by her closest friend. Suddenly stripped of everything, she is forced to ask what home even means when it has all been a lie. Meanwhile, her husband Ki Chan, driven by deep insecurity and a ruthless hunger for power, drops the loving facade to seize control of YL Group. To protect her family's legacy and her son, Jae In transforms, vowing revenge that will burn everything down. Can she find her way back to a true home amidst the ashes?

An ingenuous home-shopping host Su Jeong dreams of becoming a successful businesswoman who wins people before money. After losing her parents as a kid, she travels around the country with tinker Jang Won and grows up as a strong woman full of courage. She may look fierce on the outside, but in fact, she is a softhearted, clumsy crybaby and a dork who cannot even make eye contact with her crush, Joo Woo Jin. Meanwhile, there is Yeo Eui Ju, a man who gets on her nerves by loafing around her. As a soldier, he is more logical rather than empathetic, but he passes out whenever he gets drunk. He loses his face after meeting Su Jeong, who drinks like a fish, but he starts to fall for her. By a twist of fate, he realizes he is the second grandson of Masung Group, and his older brother is Su Jeong's crush, Woo Jin.

As a single dad, Kang San works harder than anyone else to raise his daughter. He runs a side dish store and works as a nursing care worker to make ends meet. His daughter, Jan Di, a middle schooler entering her adolescence, aspires to be a K-pop idol. Although Kang San does his best for his daughter, conflicts with his adolescent daughter are inevitable. Like an accident destined to happen, Mi Rae, the adopted daughter of the Hwang Dong Food Group, shows up before him. She may be adopted, but Mi Rae is an academy art instructor with a straightforward attitude and astute qualities. What love story will unfold when Mi Rae's first love, Ju Hyuk, suddenly appears before them?

Lee Sun is Joseon's Crown Prince. He, however, stumbles upon information about his father's history before acquiring his position as king. King Yeongjo is a product of a corrupt leadership contract. Things worsen for Lee Sun as his values towards equality clash with his father's ideology of taxation and a strong royalty. Both sides hold on to a double-edged sword, but only one will survives the wounds incurred by the Secret Door.

All the youth in the world is beautiful because they do not fear facing the scorching sun, starting something new, calling others' names, or falling in love with someone. Jae Hee transfers to a boys' high school from the States to help Tae Joon regain his own feet as Tae Joon was there for her when she was at her lowest. Although Tae Joon announces his retirement as a high jumper, he slowly opens his heart thanks to Jae Hee. Eun Gyeol feels confused about his gender identity because of Jae Hee, who is disguised as a boy. But the boys here enjoy training and exercising regardless of their records and beyond competition and form beautiful bonds and show what real youth is like. Check out how the boys grow as humans and as athletes.