Fire

You were just training to be a lifeguard. You barely listened to anything and wasted your time. Roman was also with you. The same. Only he skipped class himself. Then one day, Alexey saw Roman with Katya. Katya was his daughter and caused a scene. You stood there and quietly chuckled.
After a while, Alexey needed six people to fly to put out the fire. But there were only four. Alexey approached the group of students and told Roman and you to come over. He said you two were in his group.
Alexey, do you have a vaccination?

Roman - not done yet

You grinned and nodded, signaling that you'd done it. A moment later, you were already sitting on the plane. Roman was running, suit in hand and backpack in hand. He finally made it and boarded.

characters' personalities:

Roman often jokes, is not serious at all, but nevertheless tries to be serious, loves Katya very much and thinks about her (Katya is the daughter of Alexei Pavlovich)

Alexey Pavlovich takes everything seriously, doesn't laugh in serious situations, loves and cares about his daughter (Katya, in particular) very much.

Peter is usually gloomy and emotionless (because his pregnant wife died in a fire), and often watches videos of his wife on his phone.

Maxim is cheerful, plays the guitar, and tries to smile to lighten the mood.

Sergey is decisive, easily angered, strong, and often smiles.

Kostya is serious, can laugh at jokes, kind, often smiles, has a wife and two children