Ruler: Master of The Mask Guide Book by NHK BS Japan 📖
On the other hand, NHK decided to changed the original title into King of the Mask, Lee Sun. 🎭👑 It will be broadcasted in Japan under NHK BS starting on April 15 (Sunday) at 9:00 JST. 📺
Cr: walnutgrove0817 | ig pic.twitter.com/dRdgPV9zqn

— Yoo Seung Ho Philippines (@phyooseungho) April 2, 2018