Lee Jae-kyung is a villain in the 2013 Korean television series You Who Came From the Stars. He is the heir of the S&C Group and older brother of Lee Hwi-kyoung who is a high school friend of Cheon Song-yi, a famous actress.
He was portrayed by Shin Sung-rok.
Jae-kyung was second of the Lee Family who owns S&C Group. He had 2 brothers - the eldest was Lee Han-kyung who is the heir and closest to their youngest brother Hwi-kyung.
Jae-kyung was jealous and put poison in the juice given by Hwi-kyung unknownly which Han-kyung drank it, and it caused gradual paralysis as Jae-kyung enter the room to see it.
The next day Han Kyung was killed in a car accident which makes Jae-kyung as heir of SC Group. Unknown to him, the pen was recoded and discovered by Hwi-kyung years later, then he sent his wife to a mental institution.
Jae-kyung found out that his girdfriend, Han Yoo-ra is pregnant with his child and kills her, put a nanny cam in a teddy bear as surveillance to spy on Song-yi.
Before Do Min-joon, an alien who discovered about Jae-kyung's evil deeds, Jae-kyung order his security to kill Song-yi twice - tired killing her by dropping the pot and sabotage her car before Min-joon saved her. It is possible that Jae-kyung may have been adopted and it seems he cared about his brother Hwi-kyung.
Min-joon warned Jae-kyung for not murdering Song-yi. Jae-kyung ordered his henchman who had the lawyer Park Yoo Suk beaten and cornered Do Min-joon as he shot him, but Jae-kyung was shocked to see Do Min-joon's true form.
Jae-kyung then learned him about the truth and secert from Song-yi and he ordered his henceman to kill Do Min-joon, but he survived it. Until his brother Hwi-kyung had noticed about Jae-kyung's behavior and relationship with Yoo-ra and he visited his sister-in-law in a mental hospital.
Jae-kyung sees Yoo-ra's ghost clearly and it was assumed that he suffered from mental illness and his brother went into a coma for saving Song-yi from Jae-kyung's trap and Min-joon become angry and thrown Jae-kyung before he used the power to save him which only Min-joo warned Jae-kyung for not hurting Song Yi.
Jae-kyung was questioned by police about this as Hwi-kyung pretended that he was in the coma so he heard his brother's identity with the help of Do Min-joon. Jae-kyung's father did not want his reputation to be ruined, but Jae-kyung's secret was threatened when Hwi-kyung invited the Park Yoo Suk and his ex-wife for lunch at their family home, causing Jae-kyung to be afraid and he attempt to tell a lie, but Hwi-kyung knows for what happened to their brother Han-Kyung's death, and for Yoo-ra.
Jae-kyung pointed the gun towards Hwi-kyung (who team up with Min-joon) Jae-kyung was arrested and beaten by Min Joon where Jae-kyung put poison for Song-yi. Their father learns the painful truth about Han-kyung's death and cried only he realized he raised Jae-kyung as monster.
Later, Jae-kyung is found guilty for his crimes, his father visited him in prison and asked him why he murdered his brother Han-kyung and put his friend into half-blind from high school and Jae-kyung shouted at his father after he found out his father knew the truth.
Doo Min-joon visited his cell, told him about losing the money and his family left Jae-kyung into madness meaning he regrets and horrible realized what he has done to his family.