Frostrain 2 has three playable story conductors, each with two permanent starting traits and three conductor-specific Frost modifiers. Choi Soon Ja is available immediately; completing Normal difficulty with Choi unlocks Im Seok Dae, and completing Normal with Im unlocks Joe Mi Mi.
Unlock order
Tutorial and Choi Soon Ja are available on a fresh profile. To advance a conductor’s difficulty, win at the highest Frost level currently unlocked for that conductor; repeating a lower difficulty does not advance the sequence.
- Complete Normal as Choi Soon Ja to unlock Frost 1 for Choi and Im Seok Dae.
- Complete Normal as Im Seok Dae to unlock Frost 1 for Im and Joe Mi Mi.
- Complete Normal as Joe Mi Mi to unlock Frost 1 for Joe.
- Complete Frost 1 to unlock Frost 2, then Frost 2 to unlock Frost 3.
- Complete Frost 3 to unlock that conductor’s special skin.
The standard conductor illustration also advances with difficulty progress. Frost 3 remains the maximum selectable difficulty; the next progression step is used for the special skin rather than a Frost 4 setting.
Conductors and starting traits
Starting traits are active from the beginning of every run with that conductor. The effects below list their direct mechanical impact.
Choi Soon Ja
A calm and logical idealist. Available from the start. More train space and a larger starting population, balanced by immediate crowding pressure.
| Trait | Exact effect |
|---|---|
| Flawless Execution | Deployable carriage capacity +2 |
| Malthusian Trap | Start with 2 copies of Shanty Carriage; gain 4 passengers |
Im Seok Dae
A stern and authoritarian realist. Complete Normal difficulty as Choi Soon Ja. Extra Supplies from leveling and stronger Happiness output, with recurring Extreme Stress events.
| Trait | Exact effect |
|---|---|
| Strongman | Gain 3 Supplies whenever you level up |
| Obsession | All carriages’ final Happiness production +5%; Extreme Stress occurs every 8-10 days |
Joe Mi Mi
A bold and decisive revolutionary. Complete Normal difficulty as Im Seok Dae. Three Stability systems and repeatable pledges create the most politically demanding campaign.
| Trait | Exact effect |
|---|---|
| Ruler | Start with Economic, Political, and Military Stability at 100 each; enables three stability-crisis events: Livelihood Collapse, Rival Government Appears, and Rebellion |
| Proving Competence | Unlocks pledges through the scroll in the upper-right corner; completing a pledge lets you declare another |
Frost difficulty modifiers
Frost modifiers are cumulative. Frost 1 adds the first modifier, Frost 2 keeps it and adds the second, and Frost 3 activates all three. Active modifiers shows the complete set applied at that level.
| Conductor | Frost level | New modifier | Exact effect | Active modifiers |
|---|---|---|---|---|
| Choi Soon Ja | Frost 1 | Low Approval Rating | Decisions take 30% longer; Unhappiness increases by 25% | Low Approval Rating |
| Choi Soon Ja | Frost 2 | Cramped Train | Deployable carriage capacity -1; Drone Supply offers 1 fewer option | Low Approval Rating; Cramped Train |
| Choi Soon Ja | Frost 3 | Irritable Passengers | Unhappiness increases by 75% | Low Approval Rating; Cramped Train; Irritable Passengers |
| Im Seok Dae | Frost 1 | Endless Winter | Blizzard movement speed increases by 5%; Unhappiness increases by 25% | Endless Winter |
| Im Seok Dae | Frost 2 | Great Famine | Every 4 days, gain 3 copies of Supply Shortage; Decisions take 15% longer | Endless Winter; Great Famine |
| Im Seok Dae | Frost 3 | Lifes Precipice | Start with 6 copies of Tension; Unhappiness increases by 35% | Endless Winter; Great Famine; Lifes Precipice |
| Joe Mi Mi | Frost 1 | Doubt | Drone Supply offers 1 fewer option; all carriages’ final Happiness production -30%; Economic Stability -1 per day | Doubt |
| Joe Mi Mi | Frost 2 | Social Collapse | Economic Stability -1.2 per day; Political Stability -1.2 per day; Military Stability -1.2 per day | Doubt; Social Collapse |
| Joe Mi Mi | Frost 3 | Apocalypse | Unhappiness increases by 65%; every 3 days, gain 2 copies of Supply Shortage | Doubt; Social Collapse; Apocalypse |
Victory unlocks
These rewards are granted the first time you clear the highest difficulty currently available for that conductor. The Normal and Frost victories must therefore be completed in order.
| Conductor | Completed difficulty | Unlocks |
|---|---|---|
| Choi Soon Ja | Normal | Unlock Frost 1; Unlock Im Seok Dae |
| Choi Soon Ja | Frost 1 | Unlock Frost 2 |
| Choi Soon Ja | Frost 2 | Unlock Frost 3 |
| Choi Soon Ja | Frost 3 | Unlock Chief Researcher skin |
| Im Seok Dae | Normal | Unlock Frost 1; Unlock Joe Mi Mi |
| Im Seok Dae | Frost 1 | Unlock Frost 2 |
| Im Seok Dae | Frost 2 | Unlock Frost 3 |
| Im Seok Dae | Frost 3 | Unlock Tyrant skin |
| Joe Mi Mi | Normal | Unlock Frost 1 |
| Joe Mi Mi | Frost 1 | Unlock Frost 2 |
| Joe Mi Mi | Frost 2 | Unlock Frost 3 |
| Joe Mi Mi | Frost 3 | Unlock Midwinter Girl skin |
Tutorial preset
Tutorial is a separate onboarding preset available from the start. It has no conductor traits or Frost modifiers and is used for the coronation rehearsal and basic train-operation lessons.