Wow, this series really hooked me from the first arc — and yes, I kept track the whole way through. 'I Thought My Time Was Up' currently runs to 72 chapters in total. That count includes the main serialized chapters that map the core plot; there are also a handful of extra one-shots and side chapters the author released around special dates, but the numbered storyline stops at chapter 72.
I followed the release schedule closely and noticed the pacing shifts around chapter 40 when things ramp up toward the second big arc. If you’re reading on official platforms (the English releases mirror the Korean numbering pretty faithfully), you’ll see chapters labeled 1–72 with occasional short extras listed separately. Those extras are fun for character beats and small epilogues, but the meat of the story is in those seventy-two main chapters.
If you’re new to the series, I’d suggest reading straight through to chapter 25 to get a firm handle on the worldbuilding and then binge the rest when you’ve got time — the author loves dropping mid-chapter cliffhangers. For collectors, compiled volumes (if you prefer paper) usually group 8–10 chapters per volume, so expect about seven or eight collected volumes worth of material. Personally, the series stayed with me after finishing chapter 72; the way the author closes threads while leaving a few doors open is the kind of bittersweet finish I love, and those extras add a little extra warmth to the ending.