This is a fun idea! It's also funny for me because this is how my novel (actually a writing x comic fusion) starts off, too. Hi-five!
My main character, Gavrill, starts the story by coming home after being wrongly imprisoned for 10 years. In exchange for his freedom, he becomes a mercenary for a secret organisation that hunts down cosmic horrors, and the only way out of the organisation is through dead. So he's pretty much stuck in there until he kicks the bucket, but it's worth it because he also took this job for the sake of seeing his family!
His three children did grow up for 10 years without him though, so they're pretty estranged. One of them is even already an adult. So the whole story is about Gavrill trying to balance reconnecting with his three kids, while trying not to die to The Horrors at work, while also trying not to bring his trauma from work to home. (Unfortunately, the last part is ineveitable.) It's not all grim though: it's a blend of wholesome family slice-of-life with tragedy and hurt/comfort.
Your comic sounds really interesting! I gave it a quick peek and I love your art style (I like the colours and textures!). It's also really cool that both of our stories are historical, too. (Well, my story's set in 2017, but there are arcs of flashback to historical conflicts Gavrill grew up in!)
I'm definitely going to sub to your story and read it proper when it's not almost midnight here. Good luck with it! If anyone would like to check mine out, here it is!
