Why did Kakashi grow round eyes in Naruto?

That day was the day when Kakashi became forbearing, and it was also the day when he first performed his task as a captain. Due to the lack of talents in Muye Village, Kakashi, who was forbearing for four generations, had to perform tasks separately, while Daitu and Lin were made up as Kakashi's subordinates. In order to celebrate Kakashi's promotion and forbearance, four generations of Mulin gave gifts to Kakashi, except pushing. Kakashi reached out to him for it, but he couldn't take it out. Kakashi said that it is also a burden to want useless things. Detu was not convinced of Kakashi.

On the way to the mission, Kakashi knocked down a large number of enemies with his own moves, but in the face of the incoming enemies, he cried in fear. However, Kakashi, as the captain, went his own way, regardless of his companions, and just followed the ninja rules blindly, which made Dai Tu feel very dissatisfied. Afterwards, in the mouth of four generations under one roof, Tu Tu learned that Kakashi's father, known as Qimu Shuomao, was once the pride of Konoha, but in a mission, his father gave up the mission to save his companions, which brought great losses to the village. His father was severely scolded by the villagers and eventually died of depression. Since then, Kakashi believes that ninjas don't need feelings, and only performing tasks is what ninjas should do.

After four generations living under one roof separated from Kakashi, Kakashi's group suffered a blow from the enemy, and the medical ninja forest was taken away by the enemy, eager to save the forest, but Kakashi thought the task was more important and broke up without saving the forest. He took the soil alone to save Lin, but how could he save Lin when he was in danger? Facing the crisis, Kakashi appeared with his father's relic-the white tooth knife. It turned out that he finally accepted "I think Qimu Shuomao is a real hero!" I figured it out. In the fierce struggle with the enemy, Kakashi was injured in his left eye by the enemy and was in danger of blindness. The weak Tui finally stood up this time and opened his sharingan! The two men worked together to rescue Lin, but Kakashi, who was invisible to his left eye, was attacked by the enemy in a dead corner. In order to save Kakashi, he was pinned down by a stone and was dying. Before he died, he said to Kakashi:

"Oh ... ah ... almost forgot ... just ... I didn't send you a gift to congratulate you on your promotion ... Kakashi ... I was thinking ... what should I give you ... now ... I finally understand ... hehe ... you can rest assured ... it's definitely not useless ... the extra burden. ...

Therefore, the medical ninja forest transplanted saringan with soil to Kakashi through surgery. Tu Tu said, "I'm going to die soon ... but ... I can still be your eyes ... and continue to see the future ..." Then I entrusted my beloved Lin to Kakashi. In order to save the forest, they left the soil there, and Kakashi, who is integrated with the soil, struggled to kill the enemy!

Before she died, Daitu thought, "... finally ... I can get along with Kakashi ... but ... finally ... I can't ... confess to Lin ... I hope I can still be with you ..." With such regret, Daitu passed away, and later Kakashi told Lin that Daitu liked Lin very much. Lin soon left Mu Ye village.