Wash the lettuce, remove excess water, and cut into bite-sized pieces.
Drain the tuna using a strainer, and finely chop the Cheongyang peppers.
In a bowl, mix tuna, chopped spicy peppers, and mayonnaise together.
Place a seaweed sheet on a bamboo mat, spread a thin layer of rice, and lightly sprinkle with salt.
Lay the lettuce on top of the rice, then add the tuna and spicy pepper mixture.
Roll the gimbap tightly and cut it into bite-sized pieces.