Pulse Monitor

One like the day, the other liked the night.
One liked things bright, the other dark.
One was a healer, the other was death.
Two people so opposite, how could they even stand each other? Well, they couldn't at first, but later this discomfort paved a way to a very sweet and romantic relationship. The only question remains how? Let's see...

*All characters owned by Rick Riordan
** Cover credit: Elentori on Instagram