Donghae as Rose DeWitt Bukater
He is engaged with Siwon, but he dosen't have feelings for him. Someday he meets Eunhyuk, who safed him, he starts to meet him secretly and falls in love.

Eunhyuk as Jack Dawson
He is a young, poor guy, who earns his money with dance and rapbattles. He falls in love with Donghae at first sight.

Siwon as Caldon Hockley
He is Donghae's fiance, but he only arranged the engagement because he wants the money of Donghae's family.

Heechul as Ruth DeWitt Bukater
He is Donghae's "mother". He supports Siwon in everything and hates poor people. Besides that he likes to be called "mother" and likes to wear female clothes.

Kyuhyun as "Valet" Spicer Lovejoy
He is called valet but actually he is a hatchet man who suffers from Philophobia (afraid to love and be loved).

Sungmin as Fabrizio
He is Eunhyuk's best friend, who makes friends very fast.

Kibum as Tommy
A passenger of the third class and friend of Eunhyuk and Sungmin, who likes to talk bad about 1st class passengers.

Leeteuk as Captian "Edward Smith"
He is a long experienced and excellent captain. He has an affair with his boatsman.

Zhoumi as 1st Mate "Murdoch"
He is Leeteuk's "right hand" and is very proud of his long legs.

Ryeowook as 5th Mate "Lowe"
He makes friends with Sungmin and Eunhyuk and notices that somebody shadows them.

Henry as Helmsman
He is always happy and friendly to everybody and called the "High Spirits Maker" by his colleagues.

Kangin as Boatsman
He takes care of order on the ship. So he is called the "policeman".

Hangeng as Mr Thomas Andrews
He is the engineer of the Titanic. He falls in love with Heechul and tries to help Donghae and Eunhyuk.

Yesung as Joseph Bruce Ismay
He is the owner and funder of the Titanic, but sometimes he acts as entertainer with his "professional" dance moves.

Shindong as Molly Brown
He is a new rich member of the 1st class passengers. He is looking at recognition from Heechul and Siwon, but all in vain, so he starts to help Eunhyuk.