You're all good lol, main takeaways from this episode, at least on Jinshi's part is that
1. He's not an eunuch
2. He's repeatedly taking medicines to suppress his libido
3. He's 19 and not 24
anything else is a spoiler that I can't say but just keep it in mind. You honestly might have to rewatch some parts on your own cause I know I had to pretty often with this show from this point onwards, and it's hard to explain things in full detail cause stuff gets revealed over time. If it's something you're supposed to understand I'll try to let you know tho