From a 4-year consecutive term constitutional amendment to a 4-year multiple-term amendment...

He is not seeking consecutive terms. He wants multiple terms.
This explains the strange behavior where the President keeps dividing his own power to Party Leader Kim Min-seok, and the reason why he refuses to reform the prosecution even at the cost of his life.
Consecutive term (연임) = Maximum 4+4 years, then cannot run again; the current President is also restricted by this.
Multiple terms (중임) = Unless specifically restricted by the Constitution, 4+4+4... or 4+4, then a break, then 4+4... is possible.
Alternatively, one could run again under various pretexts after an early termination of the term.
The cunning steps:
1. Stealthily divide presidential authority to the Party Leader.
2. During the general election two years later, end his current term and amend the constitution to allow 4-year multiple terms.
3. Instead of calling it a "constitutional amendment," bundle it as a "New Constitution" and run again under the 4-year multiple-term rule.
4. If bundling it as a "New Constitution" is difficult, make Kim Min-seok President temporarily while he secures domestic power as the Party Leader.
5. Four years later, replace Kim Min-seok and run for office again.
Since Kim Min-seok and Lee Jae-myung have different agendas, a power struggle is inevitable.
To achieve this, prosecutorial power is needed to impose judicial risks on Kim Min-seok.
His own judicial risks can also be resolved using prosecutorial power while serving as Party Leader.