There is often a thin line between an agreement and a promise, and sometimes the two can even be used interchangeably.
However, people tend to despise agreements and regard them as something that is only verbal and can be changed at any time.
All in all, this is a piece of rubbish and bloody Danmei practice writing that was written during the period of writing... I'm covering my face.
Strictly speaking, this article is unfinished... Orz
Intention: