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I decided to reread this story(well it is one of my favorite manhwas and can't stop rereading this), and I came to the realization that Yoonseul rejected Jun on his birthday(the first 'ending'), and then they got to be in a relationship also in Yoonseul's birthday and this time, he is the one confessing his feelings to Jun(and this is the third 'ending' hence the title). They have come a whole circle actually.
I also like the detail where before, Yoonseul's reminder on Dec 23 is his birthday, of course haha, and when they got into a relationship, he then marked it as their anniversary. This is shown at the first special chapter. They are really so so cute.
As I read the chapter again, apparently any flower can be used to be floated in the chalice. Which is why there are a lot of flowers, which Tei can choose from. He chose the rose, out of all the many flowers in front of him, which for me, can symbolize that he is also willing to give his heart to Shuraka (as this the meaning of rose in the language of flowers in Arnata and Tei is already aware of that). He is kindaaaaa lowkey telling his feelings to Shuraka is the same passionate deep love Shuraka has for him. Such a nice little detail actually