Yes, this is BL.
Spoiler!
They currently are deveolping feeling for each other but the woman Seong-rok liked (guy with red hair) is getting in the way because she technically has feelings for him too but now that he moved on from her she's jealous and hates Je-oh.
I can't tell you what to do but I reccomend reading it even though it's not completed. :)
✰ ɪ ʜᴀᴠᴇ ᴀɴ ᴜɴʜᴇᴀʟᴛʜʏ ᴏʙꜱᴇꜱꜱɪᴏɴ ᴡɪᴛʜ ʙʟ ✰