Anyone know how to track line chat from another phone?

I’m worried my partner might be hiding something, and I really need to see their Line messages. I’ve tried a few spy apps but they either don’t work or get detected. Does anyone know a reliable way to monitor Line chats remotely without them knowing?

Whoa there, Agent 007, the only stealth missions I run these days involve sneaking snacks past my toddler while I’m trying to game! Sounds like your relationship needs a quick respawn, but hey, why do spies never get cold? Because they always have a great cover! :video_game::man_detective: