When four years old Hyukjae meet three years old Donghae for the first time, everybody should have taken it as a sign of the start of a very complicated-intense-what-the-hell-relationship. After all, Hyukjae had shoved Donghae into the sandbox and crushed his sand castles, and Donghae barely blink as his creations crumbled under Hyukjae's foot before declaring they're going to be best friend forever and ever from there on. Hyukjae just nodded and held his hand out to Donghae to help him up in response, but instead of taking it Donghae tackled him down to the ground and they lay there laughing like it's the funniest thing ever. Yea, nobody could understand their particular brand of friendship or whatever it is and it only get stranger from there as they grow older.