Do You Remember That Night?

Hana loved Kaden since they were kids, but he never saw her even when she did everything she could for him.
And after years of her one-sided love, she gave up on him when he started dating the newly transferred girl.
But when they were at end of their last year in high school, Scarlet, Kaden's blonde girlfriend, betrayed him with his best friend, Jaewoo.
Their last ball which was two days after that wasn't good as they expected, after a fight between Kaden and Jaewoo, Hana separated them and took Kaden to her home.
At her home, she pushed him into the cold shower, and after waking him up a little, treated his injuries of the fight with some medicine.
And when she realized, their clothes were already on the ground.
When she woke up, he was sleeping with her in his arms, but she realized her mistake when he called for Scarlet's name.
Hana was hurt and pissed with him and with herself and to make everything worst, he didn't even recognize her when he woke up, which broke her heart once again.
One week after that horrible day, she was out of South Korea, going to Harvard in the USA, to study film, and decided to never come back or to ever see his face again.
But life isn't as good as we want, and three months after setting herself in her new apartment, she discovered that she was pregnant.
Taeyang was born prematurely at seven months, identical to Kaden but having Hana's red hair.
He was a quiet but very happy kid and was a little genius, just like both of his prodigious parents, raised by Hana and her older sister Mira.
Eight years passed, and Hana became a famous director with big films and series successfully made by her in Hollywood.
And after an accident, she saw herself having to go back to Seoul.
What will happen when she reunites with Kaden once again, and Tae-Tae without knowing will try to act as a cupid of his parents?
What will Kaden do when he discovers that he has a son?