Jongwoo:

He can have the worst day, but second you give him a premade lunch his day is better. No need to waste his break going to a store to get some cheap ready-to-eat things that taste bland. And then it turns from better to amazing when he sees you even put a sweet note inside.

All the notes get pinned onto his shitty room's wall. But then they got taken down and stored in a box with a lock as he began suspecting the residents read, touch, and just do weird stuff to it.

Moonjo:

A very endearing thing. Gets a smile from him. The ladies at work get jealous seeing this, so he likes to state 'my partner made it for me, even gave me this sweet note' and reads it out. Such joy from their jealousy.

He usually just discards the notes afterwards. Few he keeps, and obviously no one is allowed to touch it. They'll get threatened, even if it's the cop patient, but he'll do it in such a way that the person is left unsure if he threatened them or just made a bad odd joke.

Junghwa:

Oooh her heart melts, even if you do this each day. Her fellow cops might tease her about it but she doesn't care. They don't get these lunches with handwritten notes. Truly needed to be able to endure this tough job.

Once she sees you she thanks you not only by words but a hug and kiss as well.