Hi Hunwoo, great to hear you playing at last
You played very well, i just have a few ideas with your interpretation, though as you know this comes down to personal preference.
The opening 5 measures sounded a little unnatural to me, i hate when this section is played strictly in tempo, i believe most of Chopin's romantic music should avoid STRICT timing altogether IMO. The opening/main theme was played very nicely, especially since so many recordings i have of this piece, the pianist seems to heavily accent the first note of the phrase that is held down. With the 'run' in the right before the agitato section i thought you could have used some rubato, because it seemed merely like the execution of notes in that part. Also the following theme after the run, until the agitato section, i thought might sound nicer with a bit of rubato (particularly hesitation) to foreshadow the explosion of emotion that is to come. I thought the next passagework section followed very nicely and was very cleanly played. The meno mosso section, sounded a little too strong for me, i like it when it sounds like more of a whisper... The a tempo section was played nicely, and you avoided sounding too pompous in the grand section that follows. The presto con fuoco section was great, you played it very cleanly:D THe appasionato section before entering that section could have had more fire, hesitation (more ritenuto) to create suspense, and perhaps a little more fury throughout the sectio. However that may only be because of the piano...
All in all, excellently played, you seem to handle the technical side of the piece very well, my advice would be just to think about how you would like to interpret EACH bar, then how that fits into EACH section, and then finally the interpretation of the piece as a whole as in the end it needs to be your interpretation. Think about what emotion each section holds for you and try to express it fully.... Ha ive gone on, its late at night... so yeah.
I cant wait to hear your recording on a quality piano
ps Post the waterfall etude as well, i am just about to begin trying to learn that piece after ive had a break from piano for a while