By Mei Park, thank you!
From this picture...
And this's what Mei found...
Park Si Hoo was filming at the Sungdo International Business District
The building in his background is Sungdo's G Tower
it's an upscale business area with some condos around
You can check more information from this link :
Songdo's G Tower
This guy is too cute, can't resist to show you!^^
Credit : weibo.com, thanks!