I used Korean eSIM that time, but I also got a call from Canada eSIM Card. I checked and found that I received a call from TELUS. I changed the option to Korean Sim, so I didn't think the fare would go out. (Even when I was in Canada, I usually set calls SIM with a Korean eSIM option, so there is no doubt.) I think it's because my cell phone is a dual SIM model, can't I block roaming at all? Because I don't want to have this bad experience next time.  For your information, both Korea and Canada are eSIM, so it cannot be removed.

Thanks.