Maybe it's a new character introduced. A girl or boy from a far - off land who has a frozen heart because of some dark magic or past experience. They come to the Naruto world and Naruto himself takes it upon himself to befriend them and melt their frozen heart.
It could be Sasuke. He has been through a lot of trauma, especially with the massacre of his clan. This could have led to him having a sort of frozen heart, being cold and distant. The fanfiction could explore his journey of slowly opening up again.
Another possibility is Kakashi. He has his own share of past traumas, like losing his teammates at a young age. This could have caused his heart to be a bit frozen in terms of fully expressing his emotions. The fanfiction could be about how he finally breaks free from that emotional block with the help of Naruto and the others in the village.
The best chapter pointer here is Chapter 56, "Popular Host L God Actually Supports Jiang Li?!". It opens with Lei Shen originally had no idea about the trending topics on Weibo. and closes on At this moment, Lu Xingchao was still in the dark..
Chapter 77 is the strongest chapter-level answer because it starts from Wen Jiaojiao's reminder calmed Shu Yan down. and follows through on But who knew that the next second, the lottery box would be handed over to....
Look to Chapter 90 for the clearest answer. It begins with Watching He Yun gradually take control of a tractor under professional..., keeps building through Director Sun," Qi Tianyu, having finished admiring, started to complain,..., and lands on Jiang Li finally let go of Jiang Yan's arm..
The best chapter pointer here is Chapter 47, "This Result Definitely Has Insiders!". It opens with Qi is actually second???] [Did the production team make a mistake? and closes on Qi is so excellent and only got 17, yet Jiang Li comes in with 22?.
A practical answer is Chapter 51, because it turns the idea into a concrete scene. The chapter opens with Oh, okay." After uttering two syllables indifferently, Jiang Li bent down..., adds pressure through With this in mind, she looked up and scrutinized the worried faces in..., and ends on If I.
The best chapter pointer here is Chapter 71, "The Theme of the First Day—Breaking New Ground!". It opens with Shu Yan curled her lips with a hint of jealousy, "When can it be my turn... and closes on Now they had to work on an empty stomach..
If you want the clearest chapter reference, go to Chapter 67. Early on, I'm pissed," Jiang Yan cursed again, "These people are too much, aren't...; later, the chapter leans on They expect us to fend for ourselves even to sleep and to eat—I mean, at....
The best chapter pointer here is Chapter 48, "All the Bitter Teas Have Been Taken Away". It opens with He Yun felt guilty for initially ignoring Jiang Li on purpose, and with... and closes on Besides, everyone's phones will be replaced with special smartphones....
A practical answer is Chapter 89, because it turns the idea into a concrete scene. The chapter opens with Director Sun took a step back, "What's the rush?, adds pressure through The camera isn't on us right now, and Director Sun doesn't know about our..., and ends on If anyone should be mocking.
Chapter 38 is the strongest chapter-level answer because it starts from Jiang Li had also observed the girl who had just entered. and follows through on He Yun coldly turned his head and continued to maintain his aloof persona..