"He" is probably Hanhoo. It probably refers to Hanhoo treating people like objects. That mentor is saying how Hanhoo is going to regret once he realizes what he thought was possessiveness was acutally love.
"He" is probably Hanhoo. It probably refers to Hanhoo treating people like objects. That mentor is saying how Hanhoo is going to regret once he realizes what he thought was possessiveness was acutally love.