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'!

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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.