Sunlands Technology Group (NYSE:STG) stock is facing sustained downward pressure on Tuesday, extending a sharp sell-off that began on Monday.Traders are heavily weighing the company's weak forward guidance against its recent operational milestones.Enrollment Reductions Drag SentimentSunlands' new student enrollments fell to 102,127 in the first quarter of 2026, down significantly from 169,083 in the prior-year period.Gross billings simultaneously declined to 304.8 million yuan from 412.3 million yuan, intensifying market anxieties regarding the company's long-term growth trajectory in China's adult online education market.Weak Q2 Guidance Overshadows ProfitabilitySunlands forecasts second-quarter 2026 revenue between 410 million Chinese yuan and 430 million Chinese yuan, representing a year-over-year contraction of 20.2% to 23.9%.This weak guidance completely eclipsed the company's first-quarter net income of 76.8 million yuan, which marked its 20th consecutive profitable quarter.Buyback Momentum Dissolves RapidlyThe plunge marks a swift reversal from a sharp rally on Friday. The initial surge followed Sunlands' announcement of a $50 million share repurchase program and the 126 million yuan cash sale of its entire stake in Guangzhou Shangzhi Side Technology Co. Ltd.Cost-Cutting Fails To Reassure MarketWhile Sunlands managed a 19.5% reduction in sales and marketing expenses to shore up its bottom line, first-quarter revenue still fell 9.6% to 440.7 million yuan.At the time of publication on Monday, shares had cratered 24.59% to $4.63, setting a bearish tone that has carried directly into Tuesday's trading session.Critical Technical Levels for STG Stock to WatchEven after the premarket slide, STG is still trading 8.6% above its 20-day SMA ($3.27) and 2.7% above its 50-day SMA ($3.46), which tells you the near-term bounce hasn't fully broken yet.The bigger issue is the longer trend: the stock is trading 15.2% below its 100-day SMA ($4.18) and 38.4% below its 200-day SMA ($5.76), keeping rallies in "repair mode" rather than a clean uptrend.The 20-day SMA remains below the 50-day SMA (a bearish alignment), and the 50-day SMA is below the 200-day SMA—confirming the death cross that formed in November 2025.