Half of the population on Teyvat received a particular mark, an indication to their fated soulmate from the Celestia, at the age of five years. Though the first and foremost red string of fate wrapped around the last finger of the left hand will appear way before that within the first year of life, if unlucky, they'd have to wait until the age of five to sees it.

It can be buzzed or flicked as a way of communication, twisted or knotted, but it can never be broken.

The captain, however, does not really pay mind about his fated one. He focuses his attention toward serving her Majesty the Tsaritsa to fight against the Celestia. Although that doesn't mean Capitano doesn't feel a slight hint of care when the thread around his finger tugged by the other side.

He doesn't hate the everlasting winter that occupied the whole nation of Cyro. Capitano could feel a cold breeze fluttering his coat as he walked on the pavement of the Capital of Snezhnaya. Not bothering the looks of fear or even slight disgrace by the watching eyes.

Capitano could hear the bell let out a faint 'cling' sound as he entered a bookstore; perhaps, by the outside eyes, it would be a simple shop that sells books. But by the Fatui, it is clearly not the case.

'Grapevines', the name of a popular and 'favorited-by-many' shop in Snezhnaya clearly shows a vague hint as to what the true purpose it is for the Fatui.

The one that stood by the counter immediately greeted him with eyes of respect, one akin to the secret agent he trained. Simply nodded as a way to greet back.

A short, exchanging sheets of paper listing many crucial information and orders in cryptic words, as if he were simply here to buy a book for personal use.

Yet his eyes landed the way his red string of fate linked to another person's finger in the vicinity of his.