Yuta gives a side-long glance at his father. As a 24 years old man inside a 4 years old boy, he doesn't know what to say or do. He doesn't know how to act like 4 years old boy right now.
This is getting awkward by each passing second. His father keeps staring at him.
Earlier, he heard him canceling all the meetings and shoving all responsibilities to his uncle.
Yuta is touched by his actions.
Since he has never experienced his father's love, even a single gesture by Kiyohira manages to swell his heart like a balloon.
However,
Looking at his father, he can guess that his father is equally nervous. His father is clutching his the fabric of his trousers. It's making him more nervous.
Damn! He is 24. What's so nerve-wracking about meeting his father?
In front of his mother, he wasn't this nervous. It's probably because his mother didn't stare at him like this. He spent two weeks with her. He knows how much she loves him.
In the original timeline, Rie died when she tried to leave Dh. Kiyohira never knew about Yuta and died after burying Rie's corpse. Yuta was raised by her killer and became an assassin + DH hacker. He killed Rie's killer at the age of 15. At the age of 24, he was killed by a woman for unknown reasons.
Yuta was reborn to his 4 years old self, a year before Rie was killed because he had a strong wish to live with his family.
Usually, we have MC/ML rebirths. In this novel, it's the son (not MC/ML) of this novel.