You Are the Best!

Kim Jung-ae (Go Doo-shim) lovingly raised Lee Soon-shin (IU) as her own daughter after her husband brought the baby home, saying that he found her alone at a bus stop. Soon-shin is a member of the "880,000 won generation", college graduates who cannot find a job and work instead in low-paying temp jobs. She becomes targeted by a swindler who claims he is Shin Joon-ho, head of a talent agency. He targets her by saying he believes that she has the potential to become an actress. After quickly signing a contract, Soon-shin discovers that she has been conned and ends up being charged the amount of money Shin Joon-ho stole from her. Shortly after this, her father, Chang-hoon (Jung Dong-hwan) dies in a car accident. The suspect is unknown, and there are no witnesses. Meanwhile, Soon-shin begins working at Black Smith, the restaurant below the Gabi Entertainment office, in order to pay off her debt. After making a bet with actress, and ex-girlfriend, Choi Yeon-ah (Kim Yoon-seo), the real Joon-ho (Jo Jung-suk), over-confident and arrogant, is determined to transform Soon-shin into a star. However, Jung-ae does not support Soon-shin taking the offer after finding out that her late husband may have an affair with another woman, who later gave birth to Soon-shin. She later discovers that Soon-shin's birth mother is the famous actress Song Mi-ryung (Lee Mi-sook). Middle daughter Lee Yoo-shin (Yoo In-na) has lived next door to Park Chan-woo (Go Joo-won) since childhood. Despite their constant squabbles, Chan-woo, now a dermatologist, still loves her confidence and prickly demeanor. Yoo-shin avoids thinking about marriage and childbirth, instead making success at work her main priority. When Joon-ho's younger sister Shin Yi-jung (Bae Geu-rin) develops a crush on Chan-woo, Yoo-shin realizes her true feelings for him. Eldest daughter Lee Hye-shin (Son Tae-young) is beautiful and competent, but feels like a failure when her marriage ends. As a single mother, she has difficulties re-entering the workforce. She later meets Seo Jin-wook (Jung Woo), a neighborhood baker, who shows her consideration and gentleness and helps heal her wounds. Meanwhile, Soon-shin has no idea that she was adopted. She continues to take acting lessons from Mi-ryung, which upsets her family. They have difficult understanding why Chang-hoon would be unfaithful. Watching Soon-shin do everything to realize her dream of becoming an actress, Joon-ho looks back on his career and finds himself changing as he discovers the true meaning of success. When Mi-ryung later discovers that Soon-shin is Chang-hoon's daughter, she immediately tries to destroy her career. Mi-ryung also informs her that she was merely a pawn in Joon-ho's bet, upsetting Soon-shin who decides to quit. Unwilling to admit his romantic feelings for her, but genuinely concerned for her welfare, Joon-ho is determined make Soon-shin return to acting, which she once said made her happy. After she rejoins Gabi Entertainment, Soon-shin also realizes that she likes Joon-ho and they begin dating. After breaking off their mentoring relationship, Soon-shin eventually finds out that Mi-ryung is her birth mother. Despite facing difficulty with her family, she refuses to live with her. Soon-shin only agrees to stay at Mi-ryung's house to keep reporters away from them. Upset at Soon-shin's coldness, Mi-ryung tells Soon-shin that Chang-hoon is not her birth father, so she has no reason to go back to her adoptive family. Soon-shin keeps her paternity a secret from her family and lives with Mi-ryung while she and Joon-ho work on her acting debut. Upon witnessing firsthand Mi-ryung's pitiful and lonely life, Soon-shin starts showing kindness to her birth mother. Mi-ryung values the relationship she's building with Soon-shin and is determined that nothing will ruin it. As Soon-shin overhears in a conversation that her father Chang-hoon died while saving Mi-ryung, she runs away and Jung-ae takes her home. Soon-shin tells Mi-ryung that if she wants her forgiveness, she must beg her family for it, and help find the suspect by coming forward as a witness. Mi-ryung refuses to do it, saying that fame is all she has. When Mi-ryung tells Shin Dong-hyuk, Joon-ho's father, to take his car's black box to the police since it recorded what happened the night of the accident. Both Mi-ryung and Soon-shin's careers are jeopardized after the news goes public. Mi-ryung eventually tells the press the truth in order to take responsibility and retires from acting. The hit and run driver is arrested and jailed. As the drama closes, Mi-ryung is living a peaceful life in a remote area. After Mi-ryung watches Soon-shin's new stage play, she makes a tentative gesture of reconciliation by thanking her and calling her "Mom" for the first time. Hye-shin is dating Jin-wook with Woo-joo's blessing, Yoo-shin and Chan-woo are preparing for the birth of their first child, and Soon-shin films her first movie with Joon-ho. He is planning on proposing to her. Jung-ae narrates these last few minutes and says goodbye to her late husband. Upon their father's death, the three sisters have grown as individuals through enduring hardships as a family. They come to realize that the most precious things in life can be found within themselves, and happiness is a blessing that comes to the courageous few who have high self-esteem and take charge of their own lives.