Super Junior's Siwon and Hong Soo Ah�showed their chemistry in behind-the-scenes photos of their romantic kiss scene for�Chinese drama 'Billion Dollar Heir'!

SEE ALSO: Actress Kim Ji Won revealed to have purchased a building for 6.3 billion KRW (4.6 million USD)

Hong Soo Ah updated fans on her Weibo on the 14th, "My first love in the drama," making�fans jealous with her BTS photos of her romantic kiss scene with the one and only Siwon. The pair, who are filming the drama in�Beihai, Guangxi, China, looked more like brother and sister when the cameras weren't rolling.

'Billion Dollar Heir', nicknamed among fans as the Chinese version of 'Heirs', portrays the story of a countryside boy who is revealed to be the lost son of a big-time CEO and fights in the battle between heirs.