What's the Lux of the Brightness of Love?

Moo Hak and Da Li visit an artist's studio, and for the first time, Moo Hak gets moved by artistic work. He also reaffirms his love for Da Li. Later, Da Li begins to suspect Tae Jin to be the culprit behind the series of incidents the gallery has had to face. Meanwhile, Si Hyung tries to blackmail Tae Jin to get out of trouble.