Eunhyuk and Donghae. Brothers and best friends. Eunhyuk being the older. Donghae being the younger. They did everything together. You would never see them alone. Even if they were siblings, they were very different. Eunhyuk was a kingka. A football player. The most popular person in school. Donghae on the other hand, was a nerd. Most people didn't even notice him.

To add another fact, their father was a policeman. The best policeman in town. Or, he was.

Now, he was just another person behind the counter in a police station. He lost his chance in a promotion because a Chinese cop received a point higher than him on their test. He would have still been outside fighting for his town if only he hadn't ran out of the police station. If only.

To make a long story short, he was almost dead. Almost broke his neck. It was his fault but now he blamed the Chinese officer. He was becoming racist. Their family is Korean. Eunhyuk and Donghae's father started to hate on China. He was filled with anger. And he took out all his anger at Donghae just because he thought Donghae was weak.

Life was becoming hell to Donghae.

To make it worse, Eunhyuk gets a girlfriend. He starts to treat Donghae differently. He treats him like Donghae is not important.

Donghae gets hurt and humiliated by Eunhyuk. He runs away.

Who knew that it would end up so badly? Eunhyuk gets killed when he gets hit by a car. He was trying to find his brother, Donghae. He was running, in the streets... for his little brother after he realizes he did something wrong...

To Donghae, it was all his fault. He thinks he was the reason his older brother is dead. It was him. He thinks he is a murderer.

He wanted to be forgiven. He needed to be forgiven.

The only person that could forgive him was Eunhyuk. Not even God.

After he finds out that Eunhyuk's heart was donated to another person, Donghae sets an impossible mission.

He needed to find his brothers heart.

He lost his brother. He lost him because of himself. Can he find the one part of his brother that was still alive?

That's how the story begins.....