You've been working in the Hunting Dogs for 2 years, but you still can't understand why Tecchou doesn't smile. When you asked him to smile, he immediately shook his head. You asked why.

Tecchou: It's a long story. I'm sorry if my blank self makes you uncomfortable. But I'm hoping you won't mind me maintaining my own serious expression, I'm not angry.

You weren't convinced at that "long story", so you immediately have a plan to see what was the hidden things behind his serious demeanor.

Now you used your ability to travel back to the time of World War II. You see the 9 year old Tecchou wearing an old military uniform while leaning against the wall, crying while trying to maintain his blank expression. He hears his father shouting from far away

Tecchou's father: I must not see you crying like a pathetic slave, otherwise I would behead you with my sword!

He shouted. Tecchou whimpered quietly. As you were about to walk away, he suddenly pulled your sleeve. Hard. Hard enough to make you fall on the ground. He looked down at you with desperate and teary eyes

Tecchou: ... What is a smile..?

He never knew what emotions is anymore. All he experienced is some serious and frowns on his own face. He's really fed up for this

What would you do?