I Know Him

Unbeknownst to Yohana, Runa had been silently observing her growing relationship with Niels. As Yohana and Niels grew closer, Runa found herself feeling more isolated from Yohana, her unspoken affections for Niels causing her distress. 

Fueled by jealousy, Runa sought the assistance of a witch, initially intent on procuring a love potion to make Niels fall in love with her and have him all to herself.

However, upon meeting the witch, the latter recognized the significance of Runa's sacred bloodline and proposed an alternative, using Runa's jealousy as an opportunity to test her magical prowess. 

This marked the inception of the first soul-swap.

Transported back to the moment of their initial encounter when Yohana had been abducted, they began to live each other's lives.