but i guess if he is not able to say the truth he might get caught? its pretty risky so thats why he wanted to ensure that he had a way out
What he really needs is not to be bounded to either Truth or False. Being a False he can lie about the incident, but he also risks being exposed if the police presses for more information, information that can be confirmed. He needs 100% control of the situation, the ability to lie at will.
He needed to say his father was a drinker (truth) and he didn’t do it (lie)
Did Jinsol set their house on fire ? But why did he need Saegye's ability for it , I mean he needs to tell lies about his father suicide