Lin Che, a descendant of the Lin family, was sent to the Warring States Period by his ancestor and became Madara Uchiha's biological brother. He has great power but is ignorant of the world. He is innocent and ignorant, loves pranks, and is a walking "trouble attractor."
In Thousand Hands, the most rational mind of the Warring States Period, he believed in order and restraint all his life, but was on the verge of losing control because of Lin Che's unintentional transgressions time and time again - experiments were destroyed, secrets were graffitied, and even important covenant ceremonies were interrupted because of him. Facing Lin Che's completely innocent eyes, Tobirama's deep love twisted into a calm and cruel punishment, and blood became his only expression.
As for Lin Che, he felt the pain, but couldn't understand the turbulent emotions beneath it. He will only bear scars, and at the next sunrise, he will continue to laugh at Tobirama, using the purest dependence to delay the last line of defense of rational people.
This is an entanglement that uses innocence as its blade and reason as its sacrifice. When what you love most becomes the most painful, who will be driven to madness first?