Ijin just wants to be with his family, living peacefully, away from dangers. But these mfs keep bothering him, like seriously, he lived many years killing and seeing people die before his eyes, and now that he's with his family again, he wants to live a new life. If Ijin were to become a bodyguard or somehow connected with Yuna's family in anyway, there will always be trouble and his family can be caught in it too.
In short, just stop bothering Ijin.