Why does this feel like I already saw this chapter before?

yeah right that’s what i’m thinking too. maybe someone reposted it

Thank God! I thought I was having some really vivid vision in this porn .

There's 2 versions of this manhwa on mangago, you can search and see. This one here is "Jiwoo's master | jealov" because is translated by jealov and the other one is just "Jiwoo's master" translated by temple scans.
The temple scans one was updated earlier this week, but since this one hadn't been updated yet someone decided to post the temple scans translation here. The chapter you read was probably from the other version.