[The Devil's Plan 3] I can't even begin to guess how Jang Dong-min counted those squares

I'm just staring at it like the cast.............
+Answer to the first problem

You have to find how many "squares (squares or rectangles) whose numbers add up to the target number" can be made like this










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Winner of The Genius 3, winner of The Genius 4, winner of Society Game 2, winner of Bloody Game 4, winner of Betting on Fact—he's won every survival show he's appeared on........ This is seriously insane
Just solving the problems is amazing, but even if we chalk that up to natural intuition, Jang Dong-min is on a whole other level when it comes to mind games too..
Jang Dong-min did the Jang Dong-min thing again lolllll. My body can only get dopamine from Jang Dong-min's gameplay now T_T He's just overwhelming. I hope he keeps dominating all the way to the final