Because of duty, they met. He had travelled from his hidden village to her snowy one to prevent the lighthouse from lighting. She left with him to prevent the others.

Because of duty, they became friends. The two mature ones of the initial group of four, they bonded over the antics of their companions.

Because of duty, they saved the world. And somewhere along the line, they had fallen head over heels for one another.

Because of duty, they separated. She had to help her people. He had to protect his. And neither could ask the other to yield.

Because of duty, they settled for second choices. And they never met again, for fear their spouses would find their only secret.