One possible scenario could be that Jane found herself in a complex situation where she fell in love with her boss without initially realizing it. Maybe they started working closely on projects, and their relationship gradually developed into something more. As they kept it a secret, there were likely many challenges, such as hiding their feelings at work and dealing with potential office gossip if discovered.
You might consider giving him some space to explore the manga on his own and then discussing it together. Sharing your enthusiasm and showing how it brings you joy could potentially get him on your side.