LEE HYUKJAE
An entrepreneur who is always busy with his work and company. One day, he finds out that he is diagnosed with the last stage of cancer. He refuses to receive the treatment. He decides to go on a holiday for the last time of his life, but since he was alone, he joins a Japanese group of tourist to Jeju. At Jeju, he meets Donghae the tour guide. Since both of them are Korean, they begin to get close with each other and developed their love feeling towards each other. They spend a week together and Hyukjae decides to stay with Donghae until his last breath. But, the news of his lost twins makes him returns to Seoul with promise that he will be back to Donghae. He never mention to Donghae that he is sick, so Donghae continue to wait for him, but he never shows up again.

LEE EUNHYUK
Hyukjae lost twin. He is the owner of The H Company. Because his company is facing bankruptcy, his girlfriend left him then he meets with Donghae who mistook his as his Twins Hyung. Eunhyuk agree to help Donghae to find Hyukjae and bring Donghae to live with him at his house. To save his company, he needs to get marry with Donghae. He makes the contract with Donghae that they need to get marry and Eunhyuk will help Donghae to find Hyukjae. After he finally saves his company, his girlfriend comes back to claim him as her while he already married to Donghae. Without his realization, he slowly falls in love to Donghae, his own Hyung’s lover.

LEE DONGHAE

The tour guides who guide the group from Japan at Jeju. He comes from a poor family and need to work so he can support his family. He meets with Hyukjae and decides to be friend with that lonely man. Later on, he falls in love to Hyukjae and spend their time together for a week. After a week, Hyukjae told him that he needs to go back to Seoul because he needs to find his lost twin. Hyukjae promise him that he will be back, so he continue waiting for Hyukjae. After two months of waiting, he finds out that he is pregnant. Siwon, his childhood friend takes care of him. After a year waiting for Hyukjae who never shows up again, Donghae accidentally sees Eunhyuk’s photo on the newspaper and mistook Eunhyuk as Hyukjae. He went to Seoul alone and looks for Eunhyuk. When he finally finds Eunhyuk, he finds out that Eunhyuk is actually not Hyukjae. They agree to look for Hyukjae together, but due to some circumstances, they suddenly are being push into marriage.