The tale of Siwon and HanGeng's growing relationship and the Possessive Princess who threatened to end it all.

What really happened when Puff came to see Heechul on his birthday? Was it just a dream inside the mind of a jealous friend? Or, was it something destined to be?

Heechul and Puff meet for a cute breakfast date.

In a land covered in ice, there live men and elves. Winter has fallen over the realms. The snow is controlled by the great Elf King of the forest and his frozen heart. In the realm of men, live three friends desperate to break the snowy spell upon the land. They venture into the forest in search of answers, but instead, are into a world they do not understand. The realms of men and elves are not meant to mix.

The YG organization has launched their TOP assassins in a conspiracy against the government and it's up to SM's intelligence team to stop them. Kim Heechul is an under appreciated assistant at the SM Security and Intelligence Agency. When Special Security Agent Choi Siwon arrives in the intelligence division, Heechul's life becomes more dangerous then he can handle.