Answer:
Correct answer is Yi Seong-Gye.
Step-by-step explanation:
According to mythology Yi Seong-Gye was founder of the kingdom in the second half of 14th Century (1392).
King Tangun is not correct answer as he was the mythical founder of the kingdom of Gojoseon.
Toyotami Hideyoshi is not correct as it refers to Japanese politician.
Sejong the Great was the fourth ruler of Korea from the dynasty Joseon.