Foreword/Description is alright except for some grammatical errors;

Description:

“.but I kinda like it.” Should be “..but I kind of like it.”

“It made us, the students feel proud of ourselves.” Should be “It makes us, the students, feel proud of ourselves.”

“Somehow it made us..” Should be “Somehow it makes us..”

“That is how charm we are.” Should be “That is how charming we are.”

“Me, Do Kyungsoo is the head boys.” Should be “I, Do Kyungsoo, am the head of boys.”

“..an organisation which consist..” Should be “..an organization which consists..”

“..who do the works the most.” Should be “..who does the most work.”

Foreword:

“The one who have to be a workaholic.” Should be “The one who has to be a workaholic.”

“..this opportunity the best we could.” Should be “..this opportunity the best we can.”

When stating a noun and specifying it afterwards, make sure to use commas when specifying. For example; you want to specify the noun ‘I’ with the name ‘Do Kyungsoo’, you will do so in a sentence by wording it as “ I, Do Kyungsoo, ...” Notice how there are commas before and after the specification.

Make sure not to mix up past and present tense verbs.

Nothing wrong.

There’s basically no plot whatsoever. Is the plot Kyungsoo leaving? Because it wasn’t evolved throughout the earlier chapters. Most of your fic was Kyungsoo solving problems the students had. 

Bad grammar.

Organization is spelled with a ‘z’ not an ‘s’.

You keep mixing up your verb tenses. Make sure you don’t mix up your past, present, and future tenses. When you mix up your tenses, your writing gets sloppy. For example;

If you write with mixed tense, your sentences will sound sloppy and confusing; “She ate a piece of candy that a boy will give her when she is taking a walk in the park.”

If you write with proper use of tenses your sentences will sound neat and easy to understand; “She ate a piece of candy a boy gave her while she was walking in the park.”

Minor characters felt unnecessary and weren’t well evolved.

I feel like Kyungsoo leaving was too sudden