It's like a drama in a way...

A couple formed between two mountaineers. Ivanhoe is the eldest son and heir, and Heidi is the second daughter, so it's not a problem, but... It was a moment when I realized how much Heidi truly loves living in the mountains. If it were between the eldest children of two mountaineer families, they could become lovers but not marry, so they'd eventually break up and find new partners. (Apparently, if the PC is the eldest and has siblings, they can also pass on their inheritance rights...)