I'm pretty deep into the webnovel scene and 'My Demonic Romance Guide' is a solid read if you're into that slightly tropey but fun urban fantasy romance. The central duo is Liana Vance, a pragmatic college student who works part-time at a supernatural archive, and Kaelen, a high-ranking demon prince who's bound to her through a magical contract after she accidentally summons him. Their dynamic drives most of the plot—she's all about rules and research, he's chaos and ancient power, so it's a classic opposites-attract thing.
The supporting cast fleshes it out a lot. There's Liana's best friend, Oliver, who provides the comic relief and human perspective, and Elara, a witch who runs a magical artifact shop and serves as a mentor figure. On Kaelen's side, you have his rival, the angelic enforcer Seraphina, who adds a cosmic conflict layer. A lot of the side characters aren't just decoration; they have their own subplots that tie back into the main mystery of why Liana could perform the summoning in the first place.