For people who don't understand Soyo here. Imagine seeing ur EX on the wedding, and ask her/him how’s the wedding/do I look happy and she/he answers “It was good.”
You see how the "Counter" is blocked by Soyo and becomes "Courier", which is refering to Mutsumi, MyGO just doesn't waste a single frame in story telling
For me Soyo is a well written character. Have a sad backstory, can be a mother of her friends, hostile and evil sometimes, and how she can't move on from her past is really relateable. Honestly I like her hostile personality more than her mother personality. I know she is being hated by everyone but her personality is kind of perfection.
I think soyo and anon are very similar that they also put up a friendly facade just for their own selfish reasons (anon putting it for show and soyo just wants people to stay with her) unfortunately, anon doesn’t give in to her evil desire and decided to move way past that and become a better person, reuniting them again (and doing for someone sake’s for the first time too) soyo probably felt a little hurt that anon act way confrontional than her even though they’re the same person.