Regarding the relevant competition regulations for the second stage:
The second stage is a knockout competition system, where two rounds of competition are held, and the winner of the total score of the two rounds advances.
Note that although it is a two-round match, there is no home or away game due to the game system. Of course, there is no other away goal.
If the total score of the two rounds is tied, then after the 90 minutes of the second round, there will be 15 minutes of overtime for each half.
If there is a tie in overtime, a penalty kick will be played.