3 rax timing where you run into oponnents natural and try kill probes or the army depending on their response (probes if allowed). Your army is not sustainable as you have no medivacs, but you are strong and you hit before protoss has enough to easily defend you. Follow up is up to yourself, as the rest after 5:00 is just what Byun did. The medivacs, barracks and cc are a must though.
Take into account that timings might depend on the game. For example: ByuN's cc was blocked. Put down immidietly at 400 minerals
Move out with army as 2 marrauders pop. Upgrades should be done by around 4:50
Factory Reactor, Starport, Concussive Shells
Terran Infantry Weapons Level 1
Factory Tech Lab
Barracks Tech Lab
The idea of this entire build is that you have a window with a sizeable army with stim and combat shields, in a timing before the protoss has critical mass. Go for natural probes or army depending on response
You want to hit at around 4:50 when your army hits both upgrades, which is why you move out at 4:15
Get +1 armor when +1 attack finishes. Byun forgot it this game. Getting a 2nd ebay with the armory is recommended
Do not produce marrauders until the first 2 noted. You do not have the gas for it. Otherwise upkeep constant mule dropping and marine and scv production - as much as possible.
SCV scout is optional however recommended as you skip the reaper, you would want to see if they built a nexus
The returning scv builds the 3rd barracks in ByuNs game, however this is optional especially if you want a closer scout than ByuN (only checked nexus).
You pull off gas temporarily because you save 50 gas from no reaper and need the minerals
you bassically always want 16 on minerals, while putting extra probes on gas. This has to wait a bit as extra scvs are taken to construct buildings. This explanation is probably an easier thing to follow than the exact instructions. This also means if you dont SCV scout, you will always have 1 scv on gas. Just always 16 on minerals