Korea history- three kingdoms' founding myths

Three kingdoms period Foundation myths of three kingdoms have fundamental influences for Korea history study , if we looks depth into those legendary historical Goguryeo’s founder Dongmyeong wang (Jumong)’s legendary had relevant significantly with another ancient kingdom in North-east Asia.-Buyeo, which later on became hostile country of Goguryeo According to Samguksagi, king of Buyeo - Jumong’s adoptive father Geumwa Wang was born oviparously from a glossy, golden egg , with peculiar shape (삼국사기-고구려扶馀王解夫娄老无子，祭山川求嗣,见大石,使人转其石， 有小儿， 金色蛙形.收而养之，名曰金蛙。及其长， 立为太子)
Jumong was son of Hae Mo su (the son of heaven) and Yuhwa- the queen of Geumwa Wang. Hae mo su fell in love with Yuhwa but they somehow couldn’t maintain their relationship. But, Yuhwa gave the birth to a giant egg under sunlight exposure, which turned out to be Jumong later. (为日所炤，引身避之，日影又逐而炤之。因而有孕，生一卵，大如五升许)금와왕 was definitely not happy about this egg, he felt humiliate for being cuckold by his queen and attempted to destroy the egg, but the egg seemed to be adamantine and unbreakable . (王欲剖之，不能破，遂还其母) After overcame innumerable hardships, she raised Jumong up with courage and patience(其母以物嚸之，置於暖处，有一男儿，破壳而出，骨表英奇)-삼국사기-고구려). As Jumong had to grew up with endless persecutes his adoptive father’s, he escaped from Buyeo palace with his follower, and founded Goguryeo
As my observation, even though Jumong was an “egg”, his historical legendaries and Goguryeo’s founding myths were hugely relevant to both former dynasties and later on three kingdoms. In the other word, Goguryeo’s founding myths served as a strong bond between the previous history (such as Old Chosen, and Buyoe) and prospective history (such as baekje). For example, as I mentioned in the beginning, according to the myth, Jumong was raised up in Buyoe under the mistreat of his adoptive father- so, he was not necessary to leave his homeland and found a new kingdom if Geumwa Wang treaded him nicely. Also, according to Samguk Sagi,