What will happen to someone who bought 100 shares of Samsung Electronics at 300,000 KRW each this year after 3 years?

Calculate this carefully. Let's assume you put the money into a 3-year fixed deposit under very favorable conditions at a 4% interest rate.
Assuming a structure where you receive 4% annually, pay interest income tax after each 1-year maturity, and then reinvest both the principal and interest at 4% for a total of 3 years.
You would get principal protection + a guaranteed profit of 3.15 million KRW.
Even so, is a savings deposit still the right answer?