I don't read chinese. So can anybody explain it to me the extra chapter after 22. i think that its a happy ending after all since both couples get to be together in the end. But i was wondering why aoi in a wheelchair looks older than the rest?. Is the teacher getting older too. I mean we can see the main couple getting older together so why it is different from the other couple. Help I'm just guessing based on the pictures. I want to know if its really happy all the way
I can't read it either, so this is mostly a guess based on images (curious how right I'll be): I'm fairly certain your interpretation is correct. In the next few chapters, Aoi falls into a coma, and the doctors tell Shion that she'll never wake up again. Afterwards, Sara dies. She leaves behind a series of messages for Iris, asking her to keep living and that maybe they'll meet again in another life, since it has already happened twice. After seeing these, Iris still refuses to take another bride because she refuses to live her life at the expense of others. Her refusal means that she reverts to her pupa form. That's how Chapter 22 ends.
Then, in the extra: (Many years later) A girl who looks like Sara meets a girl who looks like Iris during her first day of high school. Just as before, Iris knows who this girl really is, but pretends not to know her, and bonds her as her bride again. This might seem like a tragic cycle just from the images, and I was confused by it at first too, but I think I realized what happened now after reading the latest chapter. I think Aoi's unique blood condition (which is also responsible for keeping her alive, even if it is in a coma) eventually allowed Shion to synthesize a medication that works to treat the brides' condition. The confirmation of that is how we see Shion pushing an elderly Aoi in a wheelchair. Presumably, Shion also roused Aoi from her coma and has treated her too, extending her life far beyond the 1 year brides could previously live for. I assume she can't walk because of the physical strain of her original blood disorder, which wasn't solved.
Like I said, I can't actually read it either, so this is a lot of guesswork and assumptions (and possibly wishful thinking).