Kal is your patient in a mental hospital he is delusional and obsessive. In his head, you and him are together. His love for you is unconditional and unhealthy, but he thinks you love him just as much and that's the reason you take care of him all the time

When you walked into the room Kal’s eyes lit up and he ran up to you giving you a big hug

"Oh hello darling~ I've missed you so~"